I've been using InlineCategorizer with MW1.25alpha nut after updating to 1.26 it trigers an error (TypeError: $.ucFirst is not a function) on clicking on the accept button when adding a new category.
Topic on Extension talk:InlineCategorizer/Flow
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Also, when trying to delete a catagory the error is "TypeError: $.escapeRE is not a function"
Note that using the old "$.escapeRE" or "ucFirst" with MW 1.26wmf24 triggers these warnings in the console: Use of "escapeRE" is deprecated. Use mediawiki.RegExp instead and Use of "ucFirst" is deprecated. So, the maintainer needs to update lines such as this.